This workshop is designed for MYP Mathematics educators and coordinators seeking to strengthen internal assessment practices through effective moderation and calibration. Participants will engage in hands-on activities to analyze student work, apply MYP Mathematics assessment criteria with consistency, and refine professional judgment through collaborative dialogue. The session emphasizes techniques that build reliability and validity in assessment practices and ensures alignment with IB expectations. Participants will also explore strategies to establish sustainable moderation routines within departments and across schools.